An actuator includes: a motor; a housing, the housing at least partially covering the motor; a slide guide, wherein one end of the slide guide extends into the housing and another end of the slide guide extends outside of the housing; and a slide guide fastener disposed between the slide guide and the housing, the slide guide fastener comprising a limiting part and a matching part, wherein the limiting part is configured to engage with the slide guide and to be interchangeable with other limiting parts corresponding to other slide guide shapes, and wherein the matching part is configured to engage with the housing and does not need to be changed to accommodate different slide guide shapes.